I'm pretty new to the CA smog thing, so I have some questions. The car in question is an OBD2; a 96 Impala SS. I'm building my LT1 into a 383, 11:1, ported aluminum heads and a GMPP 846 cam (222/230 with 112 LSA). Many of the guys in the SS clubs have done this and it will pass the sniffer just fine with careful tuning.

After some careful searching, I really want to install the ICL at 107 to be ideal, but that puts the exhaust lobe too far ahead. To do it "right" would be to use a 108 LSA, but that's too narrow for a street EFI car with power brakes. I thought about having Crane custom grind me that cam on a 110 LSA to split the difference. Desktop Dyno sure likes it

Does CA test idle sniffer, or just the 15 and 25 mph? How will a narrower LSA affect the 15 and 25 mph tests?